The caravan of migrants making its way through Mexico is “kind of a normal event” and the United States ought not to reinforce its border against them, a United Nations official said on Friday. […] Joel Millman, a spokesman for the U.N.’s International Organization for Migration (IOM), told a U.N. briefing in Geneva there had been similar caravans for many years, and the group was still hundreds of miles away from the United States. “So (using) words like ‘invasion’ and things like that is assuming that this is a new phenomenon which is a drastic emergency, and I don’t think...